//抽象类：被abstract修饰的类
abstract class Shape1{
    //抽象方法：被abstract修饰的方法，没有方法体
    abstract public void drew();
}
class Cycle1 extends Shape1{
    @Override
    public void drew() {
        System.out.println("圆形");
    }

}
public class demo1 {
    public static void main(String[] args) {
        Cycle1 cycle1 = new Cycle1();
        cycle1.drew();
    }
}
